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Avoid coupling the sender and receiver of the request, make it possible for multiple objects to receive the request, connect these objects into a chain, and pass the request along this chain until an object processes it. This is the responsibility chain mode. In the responsibility chain mode, it is possible for each object to process the request, thus realizing decoupling between the sender and receiver of the request. At the same time, the responsibility chain mode simplifies the structure of the object, which makes each object only need to refer to its successor without knowing the whole chain, thus improving the flexibility of the system and making it more convenient to add new request processing classes. However, we cannot guarantee that all requests can be processed in the responsibility chain, and it is not conducive to observing runtime characteristics.等看了题，你们就知道，为什么要这样限定了。他们说，大儿子小儿子和闺女都在京城，郑家和张家都搬来了，他们在清南村住着也没劲了，就跟着一起来了。During the 20-day Shanghai International Film and Television Festival, the entertainment team completed 33 original articles, including 12 in-depth and feature reports. Senior editor Fei Xu has completed more than 10 original reports while arranging the trip, organizing reports and editing work. The film festival report on the interface has received high recognition from relevant departments in Shanghai.The "hedgehog" technique is a very effective one among all kinds of questions to promote business transactions. The so-called "hedgehog" reaction is characterized by you using a question to answer the customer's question. You use your own questions to control your discussions with customers and lead the conversation to the next step in the sales process. Let's take a look at Hedgehog's reactive questioning method: Customer: "Is there any cash value in this insurance? "Salesman:" Do you attach great importance to the question of whether the insurance policy has cash value? Customer: Absolutely not. I just don't want to pay any extra amount for the cash value. "For this customer, if you just sell him cash value, you will push yourself into the river and sink to the bottom. This person does not want to pay for the cash value, because he does not want to regard the cash value as an interest. At this time, you should explain to him the meaning of the term cash value and improve his understanding in this respect.Time relays are divided into two types: on-time delay type and off-time delay type, and their symbols are shown in the following figure. For the power-on delay type time relay, when the coil is powered on, the power-on delay type contact acts after the delay time (the normally closed contact is opened and the normally open contact is closed), and the contact immediately returns to normal after the coil is powered off; For the power-off delay type time relay, when the coil is powered on, the power-off delay type contact acts immediately (the normally closed contact is opened and the normally open contact is closed). After the coil is powered off, the contact will not return to normal until the delay time is passed.